Here are a few suggestions to suit a range of tastes and budgets:
Pack of 2 Fold Flat Boxes B & M £2.49 (click here to see these in use and made up - they hold a surprising amount!)
Christmas Storage Box B & M £4.99
Large Gift Box B & M £1.99
Lined Wicker Hampers £5.99 and £4.99 Home Bargains
Nice Box from Matalan £5.
Giant Gift Bag £1.00 B&M
If you are feeling creative or can't find one you like why not have a go at making your own? You could keep this simple and just wrap a box like a large lidded shoebox in Christmas paper or visit a craft store (think Hobbycraft, the Range) and get a plain box and accessories to make it special. Hobbycraft have some plain crates for £8 that could be painted/ decorated. If this is something you are going to use every year then it might be worth investing in a sturdy one which is likely to last.
Once you've got your box sorted it's time to fill it - so what could go in?
Wooden Crate £8 from Hobbycraft in a natural finish so could be painted/ decorated to your choosing!
Large cardboard lidded box from Hobbycraft £5.50, good to decorate.